Necking and drawing of rubber–plastic bilayer laminates
Necking and drawing of rubber–plastic bilayer laminates
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橡胶塑料双层层压板的缩颈和拉伸
DOI：
10.1039/c8sm00684a
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发表时间：
2018
期刊：
影响因子：
3.4
通讯作者：
Velankar, Sachin S.
中科院分区：
文献类型：
--
作者：
Ramachandran, Rahul G.;Hariharakrishnan, S.;Fortunato, Ronald;Abramowitch, Steven D.;Maiti, Spandan;Velankar, Sachin S.
本文研究了由一层苯乙烯-乙烯/丙烯-苯乙烯（SEPS）橡胶和一层线性低密度聚乙烯（LLDPE）塑料组成的橡塑复合材料的拉伸行为。对橡胶、塑料和橡胶-塑料双层膜的狗骨形试样进行了单轴拉伸试验，橡胶与塑料的厚度比在1.2-9之间。 变形的不均匀性程度通过这些测试的视频记录的数字图像相关分析来量化。在拉伸时，SEPS层表现出均匀的变形，而LLDPE层由于其弹塑性变形行为和屈服后应变硬化而表现出颈缩，随后是稳定的拉伸。双层层合板表现出介于塑料和橡胶之间的行为，随着橡塑比的增加，颈缩和拉伸程度降低。 建立了一个简单的模型，其中双层中的力被视为塑料和橡胶层中独立测量的力的总和。通过对该模型应用机械能平衡，可以定性地预测双层颈缩行为随橡胶厚度的变化。
We examine the stretching behavior of rubber–plastic composites composed of a layer of styrene–ethylene/propylene–styrene (SEPS) rubber, bonded to a layer of linear low density polyethylene (LLDPE) plastic. Dog-bone shaped samples of rubber, plastic, and rubber–plastic bilayers with rubber : plastic thickness ratio in the range of 1.2–9 were subjected to uniaxial tension tests. The degree of inhomogeneity of deformation was quantified by digital image correlation analysis of video recordings of these tests. In tension, the SEPS layer showed homogeneous deformation, whereas the LLDPE layer showed necking followed by stable drawing owing to its elastoplastic deformation behavior and post-yield strain hardening. Bilayer laminates showed behavior intermediate between the plastic and the rubber, with the degree of necking and drawing reducing as the rubber : plastic ratio increased. A simple model was developed in which the force in the bilayer was taken as the sum of forces in the plastic and the rubber layers measured independently. By applying a mechanical energy balance to this model, the changes in bilayer necking behavior with rubber thickness could be predicted qualitatively.